File management of any sort is extremely difficult on iOS. If that is your concern, do not buy an iPhone.
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Please never buy an iPhone again. Android is usually cheaper and it’s a far superior OS. The iPhone doesn’t do much that Android doesn’t do, and Android has so many amazing features (real file management, actual multitasking, not limited to iTunes for music, lots of Google compatibility features, unrestricted Google Play Store) that there is no reason not to get one. I’m about to buy an HTC One M9 and I’m very excited for the Android 7.0 features my iGarbage 7 doesn’t have.